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The OS X system must provide an immediate warning to the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) when allocated audit record storage volume reaches 75 percent of repository maximum audit record storage capacity.


Overview

Finding ID Version Rule ID IA Controls Severity
V-76013 AOSX-12-000305 SV-90701r1_rule Medium
Description
The audit service must be configured to require a minimum percentage of free disk space in order to run. This ensures that audit will notify the administrator that action is required to free up more disk space for audit logs. When "minfree" is set to 25 percent, security personnel are notified immediately when the storage volume is 75 percent full and are able to plan for audit record storage capacity expansion.
STIG Date
Apple OS X 10.12 Security Technical Implementation Guide 2018-12-24

Details

Check Text ( C-75697r1_chk )
The check displays the "% free" to leave available for the system. The audit system will not write logs if the volume has less than this percentage of free disk space. To view the current setting, run the following command:

/usr/bin/sudo /usr/bin/grep ^minfree /etc/security/audit_control

If this returns no results, or does not contain "25", this is a finding.
Fix Text (F-82651r1_fix)
Edit the "/etc/security/audit_control" file and change the value for "minfree" to "25" using the following command:

/usr/bin/sudo /usr/bin/sed -i.bak 's/.*minfree.*/minfree:25/' /etc/security/audit_control; /usr/bin/sudo /usr/sbin/audit -s

A text editor may also be used to implement the required updates to the "/etc/security/audit_control file".